diff --git a/legate/tester/stages/__init__.py b/legate/tester/stages/__init__.py
index fa8f916d5..3bdef281a 100644
--- a/legate/tester/stages/__init__.py
+++ b/legate/tester/stages/__init__.py
@@ -19,7 +19,6 @@
 from __future__ import annotations
 
 import sys
-from typing import Dict, Type
 
 from .. import FeatureType
 from .test_stage import TestStage
@@ -33,7 +32,7 @@
     raise RuntimeError(f"unsupported platform: {sys.platform}")
 
 #: All the available test stages that can be selected
-STAGES: Dict[FeatureType, Type[TestStage]] = {
+STAGES: dict[FeatureType, type[TestStage]] = {
     "cpus": CPU,
     "cuda": GPU,
     "openmp": OMP,
diff --git a/legate/tester/stages/_osx/gpu.py b/legate/tester/stages/_osx/gpu.py
index 789a15aa3..ac8f50bd3 100644
--- a/legate/tester/stages/_osx/gpu.py
+++ b/legate/tester/stages/_osx/gpu.py
@@ -18,13 +18,14 @@
 from typing import TYPE_CHECKING
 
 from ..test_stage import TestStage
-from ..util import UNPIN_ENV, Shard
+from ..util import UNPIN_ENV
 
 if TYPE_CHECKING:
     from ....util.types import ArgList, EnvDict
     from ... import FeatureType
     from ...config import Config
     from ...test_system import TestSystem
+    from ..util import Shard, StageSpec
 
 
 class GPU(TestStage):
@@ -52,3 +53,9 @@ def env(self, config: Config, system: TestSystem) -> EnvDict:
 
     def delay(self, shard: Shard, config: Config, system: TestSystem) -> None:
         time.sleep(config.gpu_delay / 1000)
+
+    def shard_args(self, shard: Shard, config: Config) -> ArgList:
+        raise NotImplementedError()
+
+    def compute_spec(self, config: Config, system: TestSystem) -> StageSpec:
+        raise NotImplementedError()